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Science

Changes in the earth and its atmosphere

The Earth's atmosphere - Foundation - Test

1.

Which is the most abundant gas in the atmosphere?

2.

Which was the most abundant gas in the early atmosphere?

3.

What is the approximate percentage of oxygen in the atmosphere today?

4.

What caused the proportion of oxygen in the atmosphere to increase?

5.

Which of the following is a reason for the decrease in carbon dioxide in the Earth's atmosphere?